Valve operating device



M30, 1936 4 5F. FISHER 2,046,255

VALVE OPERATING DEVICE Original Filed March 15, 1933 me;- j fed" vQ?" 6yQqhuw Patented June 30, 1936 UNITED STATES VALVE OPERATING DEVICE ElmerF. Fisher, Auburn, Mass, assignor of onehalf to James G. Veino,Worcester, Mass.

Application March 13, 1933, Serial No. 660,505 Renewed December 4, 19352 Claims.

The principal objects of this invention are to provide means foreliminating noise in the valve action of an internal combustion engineof the type in which the valves are in the cylinder head; to prevent thevalve stem from wearing off on one side on account of getting out ofcentral vertical position; to eliminate the sticking of the valves, andto accomplish these objects with a minimum amount of attention andlubrication.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawing, in which Fig. 1 is avertical sectional view of a valve operating mechanism embodying thevalve mechanism constituting a preferred embodiment of this invention,and

Fig. 2 is a side view of the top of the valve rod.

The method ofoperating the valve in a cylinder head of the abovedescription, which is commonly used, results in the production of noiseafter the parts have worn a little and got out of adjustment. Thisresults in additional wear and improper action to the valve.Furthermore, these valves have a tendency to get out of place to theextent of tilting slightly, thereby wearing the stem on one side. Afterbeing used awhile the surface is worn off one side of the valve stem andthe valve does not seat properly and, furthermore, it is a difficultthing to repair the valve.

This invention is designed to obviate these disadvantages. The power, ofcourse, for operating the valve is obtained from the cam It] on the camshaft I l on which rests a push rod lifter l2. This push rod lifter iscup-shaped and has a concave recess l3 in the bottom in which rests theglobular end of a push rod Hi. This recess is at the bottom of thecup-shaped rod lifter l2 and consequently always contains oil so thatthere is an oil cushion at this point. In the push rod lifter is ahollow cylinder l5, shorter than the lifter, through which the push rodpasses and which supports a spring Hi. This construction leaves a recessin the top of the push rod lifter for receiving the bottom of thespring. The spring is mounted under a recessed washer H, which bearsagainst a collar I8 fixed to the push rod. In this way there is ayielding spring .action to force the push rod up.

The push rod, of course, engages the rocker arm l9, preferably throughan adjusting screw 2B,, This rocker arm bears on the top of the valvestem 2| which carries the valve 22 integral with it.

The valve stem is located in a cast iron sleeve 23 running in a castiron guide 24.- The guide has a circular boss 25 resting on the enginehead and is stationary. The sleeve has a slidable fit in the guide andon the valve stem and it is provided with an integral spring seat 26 atthe top. The sliding fit of the sleeve on the valve stem is for thepurpose of facilitating the removal of the sleeve when the valve stemkey 29 is withdrawn.

Resting on the engine head and engaging the bottom of this seat is aspring 21 materially stronger than the spring Hi. The spring seat 26 isrecessed to receive the valve stem key 29 which positively connects thevalve stem and sleeve, but is removable to permit the sleeve to beremoved upwardly.

On account of the design of the cast iron sleeve 23 with an integralspring seat correct distribution of the heat is facilitated. The guide24 being stationary constitutes a sufiicient guide for the sleeve 23 andtogether they prevent the tilting of the valve stem and the valve andnecessitates the valve working on a vertical line at all V times. Thisprevents the wear of the side of this stem.

The prevention of noise is further assisted by the spring I6 resting inwhat amounts to a recess in the top of the push rod lifter over thecylinder l5 and exerting upward pressure against the Washer I1 andcollar I8 This takes up the slack at the points 30 and 3| where therocker arm or its adjusting screw engages vertically operating rods.This also transfers the clearance to the concave surface 13 where theaction is cushioned by the oil necessarily draining down the rod intothis concave surface.

In this way a noiseless action is secured even after the parts are wornand an integral spring seat 26 is provided which prevents springvibration.

Although I have illustrated and described only one form of theinvention, I am aware of the fact that modifications can be made thereinby any person skilled in the art without departing from the scope of theinvention as expressed in the claims. Therefore, I do not wish to belimited in this respect, otherwise than as set forth in the claims, butwhat I claim is:-

1. The combination with an internal combustion engine valve, its stemand rocker arm, of a stationary guide, a sleeve having a sliding fit inthe guide and on the stem and provided at the top with an integralspring seat, the stem and sleeve being connected to move together, and aspring engaging the seat for holding the valve V yieldingly againsttherseat.

2. The combination with an internal combustion engine valve and itsstem, of a cylinder head in which the valve is located, a guide spacedfrom 'the stem and normally resting fixedly on said head, a sleevehaving a sliding fit in the guide and normally fixed to, but removablefrom the the stem, a spring seat fixed to the stem, means l for movingthe stem and sleeve longitudinally, and a spring between the head andthe seat on outwardly. V r

v ELMER F. FISHER.

the sleeve for holding the sleeve and valve stem 5

